What about old science? Is that true? When scientists told women to give their babies "formula" in the 1960s instead of breast-feeding them, was that true? Or do you retroactively label it pseudo-science? It certainly had the blessing of the authorities (edit: the scientific authorities) at the time. What about the dietary fat hypothesis, currently falling apart after generations of being such dogma that people lost their jobs for questioning it? When did it go from being scientific to unscientific?
My point is that these boundaries are not nearly crisp and stable enough to bear your level of judgmentalism.
I'm guessing that in Myers-Briggs lingo, you're a J. I'm an extreme P. These two don't get along sometimes. Also, I'm an Aquarius.
There are great reasons to suppress pseudo-science, but the first and foremost reason is that it isn't true.